GIS in land suitability mapping


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A Practical Demonstration of use of GIS in Precision Agriculture

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GIS in land suitability mapping

  1. 1. Regional Centre for Training in Aerospace Surveys (RECTAS) Off Road 1, Obafemi Awolowo University Campus, P.M.B. 5545, Ile-Ife, Nigeria Global Spatial Data Infrastructure (GSDI) Training WorkshopTheme: “Spatial Data Infrastructure Capacity Building for West-African Professionals” (Date: 22nd – 28th May, 2011) Practical Demonstration on GIS in Land Suitability Mapping for Precision Farming by Enaruvbe, G.O.
  2. 2. Goals of GIS in Precision Farming• Improve soil management techniques• Improve yield per hectare of farmland• Improve profit per farm input• Decision support for efficient management of farming input
  3. 3. Goals of GIS in Precision Farming• GIS can also be applied in other aspects of farming – Precision fertilizer application – Productivity estimation – Monitoring crop diseases – Among many other areas
  4. 4. Goals of GIS in Precision Farming• The goal of this presentation is to demonstrate the use of ArcGIS in soil suitability evaluation.• Available dataset include geo-referenced soil data• This is saved in a folder “soil25052011”on the desktop of your computer.
  5. 5. Expected Result of this Exercise• At the end of this exercise, we should be able to identify areas that are suitable, moderately suitable and highly suitable for the production of crop ‘X` based on soil characteristics only
  6. 6. Launch ArcGIS 9.xProgram| ArcGIS | ArcCatalog
  7. 7. Launch ArcGIS 9.x
  8. 8. Connect to Folder containing the dataFile | Connect folder | Navigate to “soil25052011” on the desktop
  9. 9. Connect to Folder containing the dataFile | Connect folder | Navigate to “soil25052011” on the desktop
  10. 10. Connect to Folder containing the dataFile | Connect folder | Navigate to “soil25052011” on the desktop
  11. 11. Connect to Folder containing the data
  12. 12. Lunch ArcMap Tools | ArcMap
  13. 13. Launch ArcMap
  14. 14. Lunch ArcMap OK
  15. 15. Add DataFile | Add Data
  16. 16. Add DataDouble click “sOIL PROP.xls”
  17. 17. Add DataSelect Sheet$1 | Add
  18. 18. Add Data Display XY DataRight-click the theme display on the TOC to the left and select Display XY Data
  19. 19. Click Edit
  20. 20. Click select…
  21. 21. Double click Geographic Coordinate Systems
  22. 22. Double click World
  23. 23. Double Click WGS 1984.prj & click Ok until points are displayed on the ArcMap screen
  24. 24. Add DataSelect sheet$1 Events
  25. 25. Convert data from events to themeRight Click sheet$1 | Data | export data. This converts the sheet$1 event to shapefile
  26. 26. The theme that appears now is a shapefile
  27. 27. Raster Data InterpolationIn ToolsBox, 3D Analyst | Raster interpolation | Krigging (you can also use IDW)
  28. 28. Double click Krigging
  29. 29. Data InterpolationSelect shapefile theme ( not event) to interpolate e.g. Sample | for Z value pick the property of interest e.g. pH then OK
  30. 30. Interpolated Surface Output is a surface interpolation of pH-Value
  31. 31. Interpolated Surface• Repeat steps in slides 26-30 for all the properties you want to include as criteria in the suitability evaluation.
  32. 32. Reclass soil Raster Reclass | Reclassify
  33. 33. Data Classification Raster Reclass | Double click Reclassify
  34. 34. Select Layer to Reclass Input raster select raster to reclass e.g. pH | Classify
  35. 35. Data ClassifySelect input raster | Click Classify
  36. 36. Classification method choose equal interval | classchoose the number of classes desired e.g. 3 then OK
  37. 37. Classification method choose equal interval | classchoose the number of classes desired e.g. 3 then OK
  38. 38. Output of reclass operation
  39. 39. Reclass• Repeat steps in slides 32-38 to reclass all the criteria required
  40. 40. Overlay Operation Raster Math | double click Plus
  41. 41. Overlay OperationSelect reclassified criteria e.g. pH reclass and P reclass as two criteria for overlay
  42. 42. • Repeat steps in slide 40 & 41, but always take the result of the last overlay operation as input 1 and any other criteria as input two.• Do this till you satisfy all criteria of interest e.g overlay of N, P, K and Yield• This means you keep increasing the criteria and you classes are likely to keep changing as you do that.•
  43. 43. Label the ClassesRight click the reclass theme | open attribute table| Options | Add Events
  44. 44. Name e.g. Classes| Type is text| OK
  45. 45. Edit TableEditor | Start Editing. You may be prompted for the folder to edit. Choose the arcinfo workspace folder
  46. 46. Identify ClassesDouble click on the cells under classes and type in Suitability classes e.g. Highly suitable, moderately suitable, suitable or not suitable,
  47. 47. You now stop editing and close dialogue box
  48. 48. Double Click Reclass on TOC| click symbology| unique values | select “classes” from drop down
  49. 49. Soil Suitability Map Showing Classes
  50. 50. THANK YOU!